I am selling a transferable Colt SP1 M16 machine gun converted by Ceiner. It has the large pin and comes with the shown upper. It is in excellent shape. This is on a form 3 in Texas. I have many references available. I have high gunbroker feedback (user ID is qmaster) and the form 3 is available to interested buyers. I am likely willing to do 50/50 payment. Please see pics on gunbroker. $19000